黑格优树子代遗传评价及选择

Genetic Evaluation and Selection of Plus Tree Progenies of Albizia odoratissima

为探究黑格(Albizia odoratissima)不同优树子代幼林的生长状况,以黑格优树自由授粉子代为试验材料,对20个家系4年生幼林的生长表现差异进行分析。结果表明,黑格生长迅速,平均胸径10.16 cm,平均树高10.28 m,平均单株材积0.0560 m^(3)。不同产地和不同家系的4年生黑格幼林平均胸径、平均树高和平均单株材积均差异显著或极显著,不同性状的家系遗传力均处于中等以上水平,说明可开展黑格优良家系选择。以家系生长量、变异系数和保存率作为选择标准,筛选出1、3、6和10号家系为优良家系,入选率为20%,其平均胸径、平均树高和平均单株材积分别为11.47 cm、11.25 m和0.0696 m^(3),分别比总体均值高出12.89%、9.44%和24.29%。选出优良单株10株,入选率为1.33%,其平均胸径、平均树高和平均单株材积分别为15.50 cm、14.03 m和0.1380 m^(3),分别比总体均值高出52.56%、36.48%和146.36%。

In order to explore growth status of young stands of different plus tree progenies of Albizia odoratissi⁃ma,taking plus tree progenies of A.odoratissima by free pollination as experimental materials,differences of growth performance of 4-year-old young stands of 20 families were analyzed.Results showed that A.odoratissi⁃ma grew rapidly,with average DBH of 10.16 cm,average tree height of 10.28 m and average individual volume of 0.0560 m^(3).4-year-old young stands of A.odoratissima had significant or extremely significant differences in average DBH,average tree height and average individual volume among different places of origin and families,and heritability of different traits were above medium level,which indicated that it was feasible to carry out se⁃lection of excellent families of A.odoratissima.1,3,6 and 10 families were selected as excellent families with admission rate of 20%.Average DBH,average tree height and average individual volume were 11.47 cm,11.25 m and 0.0696 m^(3),respectively,which were higher than overall averages of 12.89%,9.44%and 24.29%.Ten ex⁃cellent individual plants were selected with admission rate of 1.33%.Average DBH,average tree height and av⁃erage individual volume were 15.50 cm,14.03 m and 0.1380 m^(3),respectively,which were higher than overall averages of 52.56%,36.48%and 146.36%.